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CA2396763A1 - Touchscreen having multiple parallel connections to each electrode in a series resistor chain on the periphery of the touch area - Google Patents

Touchscreen having multiple parallel connections to each electrode in a series resistor chain on the periphery of the touch area Download PDF

Info

Publication number
CA2396763A1
CA2396763A1 CA002396763A CA2396763A CA2396763A1 CA 2396763 A1 CA2396763 A1 CA 2396763A1 CA 002396763 A CA002396763 A CA 002396763A CA 2396763 A CA2396763 A CA 2396763A CA 2396763 A1 CA2396763 A1 CA 2396763A1
Authority
CA
Canada
Prior art keywords
electrodes
touch area
electrode
touchscreen
series
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002396763A
Other languages
French (fr)
Other versions
CA2396763C (en
Inventor
James L. Aroyan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Elo Touch Solutions Inc
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2396763A1 publication Critical patent/CA2396763A1/en
Application granted granted Critical
Publication of CA2396763C publication Critical patent/CA2396763C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/045—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04113—Peripheral electrode pattern in resistive digitisers, i.e. electrodes at the periphery of the resistive sheet are shaped in patterns enhancing linearity of induced field

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)

Abstract

A resistive or capacitive position touchscreen includes a glass substrate having a uniform resistive coating and series resistive chains of overlappin g discrete electrodes adjacent to the peripheral edges of the substrate. Gaps in an otherwise insulating linear discontinuity running parallel to each chain form resistive current paths across the touch area. There are at leat two ga ps for each electrode so that multiple current paths connect to each electrode. Each gap produces a local ripple in the voltage field which decays away with distance from the gap. Since the ripple decay length is determined by the distance between current paths, the magnitude of the ripple near the electrodes is reduced exponentially by a factor corresponding to the number of gaps per electrode.

Claims (10)

1. A position touchscreen comprising a substrate having a resistive surface bounded by four peripheral edges which terminate at four corners, said resistive surface having a touch area interior to said edges, a series resistor chain proximate each of said peripheral edges for creating electric fields across said touch area, each resistor chain comprising a plurality of conductive electrodes arranged in series with resistive regions of said surface therebetween, each electrode having an inside portion facing said touch area, the inside portions of adjacent electrodes being separated by junctions, and a discontinuity in said resistive surface adjacent to each resistor chain between said resistor chains and said touch area, said discontinuity acting as an electrical insulator, said discontinuity being interrupted by gaps where said resistive surface is intact, thereby forming parallel conductive paths across said touch area via said gaps, wherein a majority of said inside portions are connected to said touch area by a plurality of gaps, thereby forming a plurality of said conductive paths between each of said majority of inside portions and the inside portions of electrodes proximate to the opposed peripheral edge.
2. A position touchscreen as in claim 1 wherein none of said gaps lies over a junction, whereby each of said conductive paths is connected to only one of said electrodes in a series resistor chain.
3. A position touchscreen as in claim 1 wherein some of said gaps lie over junctions, whereby some of said conductive paths are connected to two electrodes in a series resistor chain.
4. A position touchscreen as in claim 1 wherein each said discontinuity runs parallel to said adjacent resistor chain.
5. A position touchscreen as in claim 1 wherein said substrate is a glass substrate and said resistive surface comprises a layer of transparent conductive material on said glass.
6. A position touchscreen as in claim 5 wherein said layer comprises at least one of tin oxide, ITO, and ATO.
7. A position touchscreen as in claim 5 wherein said discontinuity is a line where said layer has been removed, said line being parallel to said series resistor chain.
8. A position sensor as in claim 1 wherein at least some of said electrodes are Z-shaped electrodes, each Z-shaped electrode having an outside portion connected to said inside portion, at least some of said inside portions being parallel to respective said outside portions of adjacent electrodes.
9. A position sensor as in claim 8 wherein said electrodes further comprise a central bar electrode in each series chain, each said bar electrode being overlapped by outer portions of adjacent Z-shaped electrodes.
10. A position sensor as in claim 9 wherein said electrodes further comprise a right angle electrode at each corner, each said right angle connector overlapping an inner portion of one of said Z-shaped electrodes in each of two series chains, said right angle electrodes providing voltage inputs to each series chain.
CA2396763A 2000-11-03 2001-10-16 Touchscreen having multiple parallel connections to each electrode in a series resistor chain on the periphery of the touch area Expired - Fee Related CA2396763C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/705,383 2000-11-03
US09/705,383 US6593916B1 (en) 2000-11-03 2000-11-03 Touchscreen having multiple parallel connections to each electrode in a series resistor chain on the periphery of the touch area
PCT/US2001/032220 WO2002037408A2 (en) 2000-11-03 2001-10-16 Touchscreen having multiple parallel connections to each electrode in a series resistor chain on the periphery of the touch area

Publications (2)

Publication Number Publication Date
CA2396763A1 true CA2396763A1 (en) 2002-05-10
CA2396763C CA2396763C (en) 2011-06-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA2396763A Expired - Fee Related CA2396763C (en) 2000-11-03 2001-10-16 Touchscreen having multiple parallel connections to each electrode in a series resistor chain on the periphery of the touch area

Country Status (8)

Country Link
US (1) US6593916B1 (en)
EP (1) EP1330776A2 (en)
JP (1) JP4004405B2 (en)
CN (1) CN100383718C (en)
CA (1) CA2396763C (en)
MX (1) MXPA02006645A (en)
TW (1) TW550511B (en)
WO (1) WO2002037408A2 (en)

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Also Published As

Publication number Publication date
MXPA02006645A (en) 2003-01-13
JP4004405B2 (en) 2007-11-07
WO2002037408A3 (en) 2003-03-13
CN1561500A (en) 2005-01-05
AU1176502A (en) 2002-05-15
US6593916B1 (en) 2003-07-15
TW550511B (en) 2003-09-01
CN100383718C (en) 2008-04-23
CA2396763C (en) 2011-06-07
JP2004513440A (en) 2004-04-30
WO2002037408A2 (en) 2002-05-10
EP1330776A2 (en) 2003-07-30

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Effective date: 20141016